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Star Size Comparison: The biggest/largest known stars in the Universe.
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VY Canis Majoris (VY CMa) is a red hypergiant star located in the constellation Canis Major. With a size of 2600 solar radii, it is the largest known star and also one of the most luminous known. It is located about 1.5 kiloparsecs (4.6×1016 km) or about 4,900 light years away from Earth. Unlike most stars, which occur in either binary or multiple star systems, VY CMa is a single star. It is categorized as a semiregular variable and has an estimated period of 6,275,081 days, or just under 17,200 years.
Antares is a red supergiant star in the Milky Way galaxy and the sixteenth brightest star in the nighttime sky (sometimes listed as fifteenth brightest, if the two brighter components of the Capella quadruple star system are counted as one star). Along with Aldebaran, Spica, and Regulus it is one of the four brightest stars near the ecliptic. Antares is a variable star, whose apparent magnitude varies from +0.9 to +1.8.
The Pistol Star is a blue hypergiant and is one of the most luminous known stars in the Milky Way Galaxy. It is one of many massive young stars in the Quintuplet cluster in the Galactic Center region. The star owes its name to the shape of the Pistol Nebula, which it illuminates. It is located approximately 25,000 light years from Earth in the direction of Sagittarius. It would be visible to the naked eye as a fourth magnitude star, if it were not for the interstellar dust that completely hides it from view in visible light.
Rigel (β Ori / β Orionis / Beta Orionis) is the brightest star in the constellation Orion and the sixth brightest star in the sky, with visual magnitude 0.18. Although it has the Bayer designation "beta", it is almost always brighter than Alpha Orionis (Betelgeuse).
Aldebaran (α Tau, α Tauri, Alpha Tauri) is an orange giant star located about 65 light years away in the zodiac constellation of Taurus. With an average apparent magnitude of 0.87 it is the brightest star in the constellation and is one of the brightest stars in the nighttime sky. The name Aldebaran is Arabic (الدبران al-dabarān) and translates literally as "the follower", presumably because this bright star appears to follow the Pleiades, or Seven Sisters star cluster in the night sky. This star is also called the Bull's Eye because of its striking orange color and its location in the bull's head shaped asterism. NASA's Pioneer 10 spacecraft, which flew by Jupiter in 1973, is currently traveling in the direction and will reach it in about two million years.
Arcturus (α Boo / α Boötis / Alpha Boötis) is the brightest star in the constellation Boötes. With a visual magnitude of −0.05, it is also the third brightest star in the night sky, after Sirius and Canopus. It is, however, fainter than the combined light of the two main components of Alpha Centauri, which are too close together for the eye to resolve as separate sources of light, making Arcturus appear to be the fourth brightest. It is the second brightest star visible from northern latitudes and the brightest star in the northern celestial hemisphere. The star is in the Local Interstellar Cloud.
Pollux (β Gem / β Geminorum / Beta Geminorum) is an orange giant star approximately 34 light-years from the Earth in the constellation of Gemini (the Twins). Pollux is the brightest star in the constellation, brighter than Castor (Alpha Geminorum). As of 2006, Pollux was confirmed to have an extrasolar planet orbiting it.
Sirius is the brightest star in the night sky. With a visual apparent magnitude of −1.46, it is almost twice as bright as Canopus, the next brightest star. The name Sirius is derived from the Ancient Greek Σείριος. The star has the Bayer designation α Canis Majoris (α CMa, or Alpha Canis Majoris). What the naked eye perceives as a single star is actually a binary star system, consisting of a white main sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B.
The Sun is the star at the center of the Solar System. The Sun has a diameter of about 1,392,000 kilometres (865,000 mi) (about 109 Earths), and by itself accounts for about 99.86% of the Solar System's mass; the remainder consists of the planets (including Earth), asteroids, meteoroids, comets, and dust in orbit. About three-fourths of the Sun's mass consists of hydrogen, while most of the rest is helium.
http://en.wikipedia.org/wiki/Largest_stars
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CREDITS
Animations: morn1415, NASA, ESO, Hubblecast
Editing: http://www.youtube.com/Best0fScience
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A first attempt to try to visualise the effect many people experience when having a visual migraine. These are not usually accompanied by pain, but sometimes are, and you may feel nauseous through the visual stimulation. They seem to be very common. Nothing can be done to avoid them it seems, but they don't appear to do any harm either. I have learned to sit back and enjoy the show! They start in the centre of vision, move outward to the perifery, then fade and disappear.
PLEASE NOTE: Video contains black and white flashing images. If you are susceptible to such effects triggering unpleasant consequences such as a migraine or epilepsy, please DO NOT WATCH IT. See below:
One person, out of the thousands who have seen this video, has said that the combination of black and white flashing images actually triggered a migraine in him. He suggested that I didn't use the black and white flashing effect. I completely understand his point of view and apologise to him for triggering a migraine, but this video does show the vision disturbance as I see it, and I do see flashing black and white in my auras.

Amazing Optical illusions that will tease your brain
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Flat 3rd Dimension and Following eyes video by Brusspup
Includes footage produced by the Royal Institution https://www.youtube.com/watch?v=EOeo8zMBfTA
Description:
One of the most fascinating organs in our body is the human brain. You could say that it is central control, or headquarters for our body. Without our brain, we are not alive. The brain is where our consciousness lives and our memories are preserved. If we are considered “brain dead”, then the plug gets pulled on our life support. It is a complex organ of fatty tissue, and the brain helps us process different kinds of information through our five sense. Using our nose, the brain can tell us whether we are experiencing a pleasant smell or something foul. With our ears, the brain can help us process the noises we are hearing and be able to tell the difference from language to noises. With our mouth, the brain helps us figure out whether the food we are eating is good for us and not poisonous. Finally, with our eyes, the brain helps us process the information we are seeing visually. Our brain and our eyes have a beautiful relationship by letting us see colors, nature, people, and more, along with associate these visions with emotions. With such wondrous capabilities, it can be easy to just assume and trust that what our eyes are telling us is true. Well, not exactly.
In the last several centuries, optical illusions have been playing tricks with our brain and causing us to question what is real and what is fiction. Optical illusions can be created by Mother Nature, or they can be manmade, thus creating an entire art dedication to optical illusions and messing with our brain and everything that we know about the world around us. With the innovation and evolution of optical illusions, we are now getting confused more often than ever before! People have even dedicated their lives and support themselves from creating their own optical illusions. These artists even get a kick from us stepping on their painting and thinking that we are about to descend into a multiple story fall, but instead, our foot remains on solid ground.
This video has ten of the most mind blowing optical illusions. They are so crazy that you would think that they were simply a trick of the camera or computer. What makes these optical illusions extra special is the fact that they play with your perception using colors, angles, light, shapes, sizes, and more. Our eyes have been conditioned and groomed to see certain things by the way the light hits an object, or by the way and angle is seen by our eyes. Reality can be manipulated so many ways by a simple tilt of the head or a beam of light, or a splash of color. By breaking down why you are seeing the optical illusion in the first place, we can start descending upon the bridge of understanding. Probably one of the most unsettling things about optical illusions is that the seed of doubt can bleed over to our normal everyday lives and cause us to question everything by just looking outside.
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Featuring:
FLAT 3RD DIMENSION
FOLLOWING EYES
BACKWARDS CHAIR
DROP OFF ROOM
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❤ Eye Exercises For Exotropia #7 - Beginners
✎ INSTRUCTIONS FOR [EXOTROPIA] VIDEOS
● Use both eyes.
● Follow the cross inside the moving dot with your eye.
● 1 foot distance from the screen, depending on screen size. The point of the exercise is to make your eye move around the eye socket.
● Full screen display. Try using a big monitor, or a 10'' tablet, but keep your head closer to it.
● Dark room.
● If you use glasses wear them while watching this.
● Watch 2-3 videos every day, twice a day. Combine with the other videos in this channel. Change videos every week or two.